package com.example.demo.aspect;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)//只能放在方法上
@Retention(RetentionPolicy.RUNTIME)//生命周期
public @interface CostTime {

}
